* {
  margin: 0;
  padding: 0;
}
body {
  padding-top: 10px;
}
.wrapper {
  width: 700px;
  /*height: 500px; 内容区一般不给出高度，高度由内容自行撑开*/
  border: 1px solid black;
  margin: 0 auto; /*居中*/
}
h1 {
  font-size: 20px;
  font-family: 黑体;
  font-weight: normal;
  background-color: #eee;
  text-align: center;
  padding: 15px 0;
}
.content {
  overflow: hidden;
}
.aside-left,
.aside-right {
  background: url(img/grey-shadow-top.gif) repeat-x;
  background-color: #ebebeb;
  width: 150px;
  height: 400px;
}
.aside-left {
  float: left;
}
.aside-right {
  float: right;
}
h4 {
  padding: 20px 0 15px 10px;
}
ul {
  padding-left: 30px;
}
li {
  line-height: 1.5em;
  font-size: 14px;
}
a {
  text-decoration: none;
  color: #000;
}
a:hover {
  text-decoration: underline;
  color: aqua;
}
.main {
  background: url(img/white-shadow-top.gif) repeat-x;
  background-color: #fff;
  width: 400px;
  height: 400px;
  float: left;
}
.main p {
  text-indent: 2em;
  line-height: 1.5em;
  padding: 10px;
  font-size: 14px;
}
.main h4 {
  text-align: center;
}
.footer {
  background-color: #ccc;
  padding: 10px 0px 15px 10px;
  font-size: 14px;
}
